Service manual

MODEL: L423FR
Page 29
1. Power failure
(1)POWER is turned off.
Is the 24V output available at
Pins 1,2 of J9A00?
NO
YES
NO
All harness connects
correctly.
Is all harness on board
connected correctly?
Pin No. Voltage
J9A00 1,2 23~25Vdc
Confirms voltage of Pin2 of
J9E00 (INV_SW) and Pin3 of
J9E00 (BRIGHT) outputs “H”
level(about more than 2V).
If not outputting, IC300 or its
Periphral circuits is out of
order.(PWB-MAIN)
If outputting, PWB-Power is
out of order.
YES
NO
Is the 24V output available at
Pins 1~5 of J9X00 and Pins 1~5 of
J9W00?
Pin No. Voltage
J9X00 1~5 23~25Vdc
J9W00 1~5 23~25Vdc
PWB-POWER is out of order.
YES
YES
NO
Poor power plug connection. Is the power plug connected
to the wall outlet correctly?
NO
YES
Is the POWER LED lit?
Connect the Power plug and turn on the main Power switch (Front switch or remote switch).
IC300 and peripheral circuits
are out of order.(PWB-MAIN)
See trouble others.
(2) at next page